# Practice Test: Question Set - 09

**1. The breadth of a ribbed slab containing two bars must be between**

- (A) 6 cm to 7.5
cm

- (B) 8 cm to 10
cm

- (C) 10 cm to 12
cm

- (D) 12 cm to 15
cm

**2. The stem of a cantilever retaining wall which retains earth level with top is 6 m. If the angle of repose and weight of the soil per cubic metre are 30° and 2000 kg respectively, the effective width of the stem at the bottom, is**

- (A) 51.5

- (B) 52.5

- (C) 53.5

- (D) 54.5

**3. If the diameter of the main reinforcement in a slab is 16 mm, the concrete cover to main bars is**

- (A) 10 mm

- (B) 12 mm

- (C) 14 mm

- (D) 16 mm

**4. Minimum spacing between horizontal parallel reinforcement of different sizes, should not be less than**

- (A) One diameter
of thinner bar

- (B) One diameter
of thicker bar

- (C) Twice the
diameter of thinner bar

- (D) None of
these

**5. For a number of columns constructed in a rcjw, the type of foundation provided, is**

- (A) Footing

- (B) Raft

- (C) Strap

- (D) Strip

**6. A singly reinforced concrete beam of 25 cm width and 70 cm effective depth is provided with 18.75 cm**

^{2}steel. If the modular ratio (*m*) is 15, the depth of the neutral axis, is- (A) 20 cm

- (B) 25 cm

- (C) 30 cm

- (D) 35 cm

**7. In testing a pile by load test, pile platform is loaded with one and half times the design load and a maximum settlement is noted. The load is gradually removed and the consequent rebound is measured. For a safe pile, the net settlement (**

*i.e.*total settlement minus rebound) per tonne of test load should not exceed- (A) 10 mm

- (B) 15 mm

- (C) 20 mm

- (D) 25 mm

**8. The diameter of main bars in R.C.C. columns, shall not be less than**

- (A) 6 mm

- (B) 8 mm

- (C) 10 mm

- (D) 12 mm

**9. If**

*d*is the diameter of a bar,*f*is allowable tensile stress and_{t}*f*, is allowable bond stress, the bond length is given by_{b}- (A)

*f*.

_{t}*d*/4

*f*

_{b}- (B) (

*π*/4). (

*f*.

_{t}*d*/

*f*)

_{b}- (C)

*π*

*f*.

_{t}*d²*/

*f*

_{b}- (D) (

*π*/4). (

*f*.

_{t}*d*/

^{3}*f*)

_{b}**10. An intermediate T-beam reinforced with two layers of tensile steel with clear cover 13 cm encased with the floor of a hall 12 meters by 7 meters, is spaced at 3 meters from adjoining beams and if the width of the beam is 20 cm, the breadth of the flange is**

- (A) 300 cm

- (B) 233 cm

- (C) 176 cm

- (D) 236 cm

**11. The length of lap in tension reinforcement should not be less than the bar diameter × (actual tension / four times the permissible average bond stress) if it is more than**

- (A) 18 bar
diameters

- (B) 24 bar
diameters

- (C) 30 bar
diameters

- (D) 36 bar
diameters

**12. As the percentage of steel increases**

- (A) Depth of
neutral axis decreases

- (B) Depth of
neutral axis increases

- (C) Lever
arm increases

- (D) Lever arm
decreases

**13. The effective width of a column strip of a flat slab, is**

- (A) One-fourth
the width of the panel

- (B) Half
the width of the panel

- (C) Radius
of the column

- (D) Diameter
of the column

**14. As per IS : 1343, total shrinkage for a pre-tensioned beam, is**

- (A) 3.0 × 10

^{-2}

- (B) 3.0 × 10

^{-3}

- (C) 3.0 × 10

^{-5}

- (D) 3.5 × 10

^{-5}

**15. Dimensions of a beam need be changed if the shear stress is more than**

- (A) 10 kg/cm

^{2}

- (B) 15 kg/cm

^{2}

- (C) 20 kg/cm

^{2}

- (D) 25 kg/cm

^{2}

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